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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b67d94d8b933e5b37d2c01d8946377c5a424454e4edebe5536434b86bca665d' 
  AND token = 'iFmpC6sOMsPoMDbjY1qx7dJ5qZ0/Fu4JMLHXWoiTwRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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