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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69889dd3ba3ef33af2a90dca761d37d1debfbfa66d7aa5a1eb2be13a7219afc' 
  AND token = '5c8bNvOH0PRfjpO0ZKSIAw9LgHa7TeNybLoO7IA4rb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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