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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a81dbf745cc1104a8099d77bd8846ea5e31c116480686dfdf7be9dcdde2d83' 
  AND token = 'oMPS+2Jk9Whg6z6dQvhTMhZC2O0OUYeLgRSbM0Zj3VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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