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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe134f6bccd0a7c0616af1471c484e14300be067a38de17ae279d72c8c8220f6' 
  AND token = '/W2ln8ioWL7yGgDVVA+0y6JAKAj5SvTlfeF2M9jkKcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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