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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f168eb98bf8c52b3ae63891a62f3f14d6355b14a73b70a8657fd32b951e0c56d' 
  AND token = 'KYn5nTNH2V93nGluV29h3we1XGDJPd7MnBMUKUQ6II0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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