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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b683bb7db4b77d682d54fd02b200979d1a5037a1b476971056537acdaff5b1' 
  AND token = 'zh3wrp/sZBj7BTnG5Vot0GeHAdbliS365wAe/c0BVCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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