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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e628c90e3e413aaa5324b6504b97a2f784e2f3a769ff7ccb8acd0123e9ceee78' 
  AND token = 'OLkvWLLtBUIExFw1Lcpy6PUpjUox27FM99vIwbE8e7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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