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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cab7569a820efe06f98f4e106f0eb49b5ce702f11cc018f98f9fcefa6da0019' 
  AND token = 'Fmt1Sx0H/RwHtBg7iHTIwvmNRCo7WE6DCm7J9vUGK7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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