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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00511a57a70804d01de90741946ecd71de122fbeb380f456165a7ab520b804d' 
  AND token = 'xKH1Zd3cdI8JLVL3/qztzLHhpF6GT9fn0gGIQBEcPOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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