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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763251f1674d87bd77b071fb29c95e9bcd341b31cf5b1d62e729ad9999c1bb0b' 
  AND token = 'MGStim3AP3QLo/ydxmNqcUdval4+5G6HL7SPMk+ZOC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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