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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c09e536e5de8df768606000c492c8c65f9456fcdd740924bd59bbe16b180fd5' 
  AND token = 'cZ+86CDlg6xKNCHfVVPsy95l9M6qiUYZM//A+0/po0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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