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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b19eecf876a20a156943f2e1f3b73ff05c3f036c85276b6f65ee0e65281a0c5' 
  AND token = 'sfJyFGTIMShNPXEjEvJobu2Jj9jyjby8nxSir4HOfzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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