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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b87daf9057c1e35e41514f7a09ccecf56568b9f9d8581d188d2e78bc8c1ef5e' 
  AND token = 'GlLPYKzdPK59yOzP3FfrS1AkPtbENqrjs1yd7l8/yu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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