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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa54cce2b0d53f35b009af5e9e9ecd3471fa012f3f7f8ce72fd2cb6cb65c4b7' 
  AND token = '+bkynD92FOQVh3A+4/24un9dbyQVMt+BoWoh+zqoQIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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