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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdee203b4fa9c20dd91cf75790620731b5a9ae57b9a779bd8a270ebcdfc64559' 
  AND token = 'LySCZRH6gXovKw9jUL4fpVrIqI/DRItZT7bfdkiWf/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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