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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c90fe9320e1a2a7caefc7ecc896fe5051d279eb6ae8f8baf16f314d7d2047a4' 
  AND token = 'P3i/z+khXmzw6tqnUxNUixC56o82Ka2oC7IrLOajz/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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