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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abfbbe95673e32dd25f0f179a40911f2d34bb8f1540c0b92cdbf05bab322f2f6' 
  AND token = 'ad1xxP4B+zHBBwbXXhXR9RZlV1DoeG2JhXmX6TwI8gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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