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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986b92ec1a17769e895b431f6dcabadcabcddec6c0e1773c8ec160c4a51deaf1' 
  AND token = 'CH6ROuOawFC8WmiSGEvC3JzbjuLghVV7AEzvecQD9RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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