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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f267f36346ff7890943be0446b74c09a85d444f1e2399f0db0762a8e5a28d64' 
  AND token = '7mSoflLoXCq4H6MiO36QWWu/8fhIOM7qHTmCY9+rMz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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