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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db778a9cfe4b6f83f992b161b00411aff845d65c1881103ba1282c8038e0da8a' 
  AND token = 'Tw+MdPOXx5cY1nIoLdjGARysdlV4bWwfAbv5E9t4b5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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