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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56065c7de65b95dd50474d26237516b6756e39cd772e6480d816c34fbd87f69b' 
  AND token = 'f8Ds9g6m+b3BMYhu9xIx+QIaAMv0MUOVhbnFURMuW2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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