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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7170b2054fac3afe1ab086440496248e8be6734cf762f714b394cf874a3389e4' 
  AND token = '5wRprxfm+q9JWLRLUed4cyrZz7ZCj6zyDoWjFOjrYCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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