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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c64cdfc43d28860f60c2bb3dcde14ee9e9f15cc25a496a8350393e46788904' 
  AND token = 'cpXBbMWeIlf97h0Pz8srFoCNCnZL1DxUfzeliOi2n8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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