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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a87062149e5149e4d77deca1523944a02650dd5f3781cd3b396c66ab345a5e1' 
  AND token = 'dh8+coOr6CdD0OUNcGCyYVdiG5UlxFqhJOEzwBXu9lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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