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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10ec7efcaf4f7cf6f4ef2faf9c3a5e79b2a9f3e58b7927ee6d11d1d6cf4a54e' 
  AND token = 'Vz4Lsrw8fUncneg01vlyqaeq84C8nneo5DKsFPYJ8IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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