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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a5372a20ddc6f7e3fb3d623bc7cb78222b3f23cf0efb47dd14de79c6cce542' 
  AND token = 'N1Qpt911jwYzyzTNzt8ZU4fKYdbvQd00d+X8Vo/t1Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}