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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1035d80188801e71e443779641bb3f1b5e22b4b3e11f40b3a82b5f964cb048c' 
  AND token = '/JwwhFteLRWQQsqe1poIsmHN3OBaDGkCYbdUBNPUkqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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