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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b1dba037bbb02225edcde0aa4dbb4d50c2880938638ec2ab90292d4b6767a5' 
  AND token = 'c7rWRLBAdfJG4rCbdobUmlP2RV4zYdHbFZ0Y8wF1kdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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