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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa73f9484ae05125813872d001f5252fbca0f1773832791baaa8a45ba6c5382' 
  AND token = 'kMBeXF6CVYTeyyOo/Z68n7jU1c1Cem2cgL7IwKgeqdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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