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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79dbb5291d04928b4452a4eaf4aacca79d29a2df7982173610874081f6bb2b94' 
  AND token = 'YF6GGms1f4O2WNr90ZlG/DwMPMYQl/a4jw39Ou+zx9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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