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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14a7b7d5630ea15791d00b59d2b7ed27cc0b8f0f7f55cf5221f7db1a25522d4' 
  AND token = 'ED210fP8MAQoPlGyFPLenxDTSd08U5Q7ikXWi58mhCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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