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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63890aac7d3fd077f54e88e09a5ce8d70cecd956b79c7a5f82b478fd5c7cadc9' 
  AND token = 'LISxTwnO1q2Lb7Npc0aDCxTza0ffafY6ExqwPsL8exs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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