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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048b86883c56304b64abebc815dd7cbb191a19407a5711ff20fdf341b0af6296' 
  AND token = 'BJKnZtphmqfYezYqxfcE19bIVAp9YKCKw9pdA0ICsH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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