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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df66a8826e9f828ac89b88acf26d126a234d984e0a30f2dcbfcfc73b5d300ce6' 
  AND token = 'cI83d+TieVRz0wyaGoo3pN30NHFHYxzcfDqNDEoea3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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