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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d9fbb94ffcdc487753e3021f9e2616d49828932eb459a892c640892b0c8aef' 
  AND token = 'yb7dRQ0t1A1G93HMy+rp9T02TCPWkDjUklOKayk9nvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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