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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd4199141d83c11bc62b7b90157f90412e496a19e349df1b285d381bfbf47f1' 
  AND token = 'V30+yAvjBlz0x0RKv1LOMACe/0dhIRae0KrcXfPx5gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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