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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29338bb206f1ae1af603fb0617da36104836c389b0d94af549f92b4eddf5efb2' 
  AND token = 'yQbhPuZTl9S2NyNu29aeY2ypp07H+o6ImVrGgvU7kh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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