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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dea9aadc8a82e7861d1b2d0535dc35f82a0a7684c87d4a7ae3311474d01e45f' 
  AND token = 'aSdQT7vpB3WyHjsCZS/H6yITk2Vbm39ryGDUZcdlJ6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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