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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe59c38e68c1049fb220153bfb242afd1e6659b4e9da1d3b2a57480d2997ca42' 
  AND token = 'ujdflA7qW42ll/f2HwipaPa5SQ6LmlV/eZmit1PibXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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