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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d34209517c3f2fec4cd157e3d214e208484400315b8856b557ce53fe51be39' 
  AND token = 'bT9DG35aaIak9xxfwWUTnhLddxCUP0O2bMfLw9mK1GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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