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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eaf7d85ead5f1c50ac919cf1c75d1a869524fa888c95c04998ca0676c1910cb' 
  AND token = '9DHCY8MtmfPsufgANzInXcPfYY9IdGj7/1PfeUjGJlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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