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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d47958e6077012499865470d64d18e5a4d9c64895388ce4cf084007b16a6fe' 
  AND token = 'zeI7aEtzUSKOcofwdwHYn2kpJqbh23cGJZqY/FDbP94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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