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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad9e41c11128a1980483992e9ea232f866ab7c8833243061ae25dcad9760548' 
  AND token = 'DJpHDJHqp4BxEHDEOIRz3ynhqYymxe5yhxbQs4MfwHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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