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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817c522aac2651e32e652f7b14bc6b4e7eb5ddc92f1ffcf43af7f069fedd71f2' 
  AND token = 'uDT1FJ0Oq4fPmHPpMW2vqXXnuju/dt6Y0TFeMI6D85Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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