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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930ffd16234578398e1305e89d57cbec447a33772ce8377c896455e9bbe620d8' 
  AND token = 'qfJ3pc/ppYex45oYR0sVGp2DD/tuyJbGbGiMkTE+GmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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