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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3444eca2ea95a8febb1586d9dde25cef97b6a3c1b3d486d9a052d0b5173152' 
  AND token = 'HEai7dWqRjFzLBAgrt3HPDtD3BcjiahYRaaYSVEO9Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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