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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff792905001359de2ca6fe732d121919985c0cb9c3d98cd4f6b306799dffbd2' 
  AND token = '8J0Mu2sLy9vuYYRC8K30PlqJMI8InHtN6VcEF2Sb99U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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