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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9930823720b5a8538f5f0753453854c5377b2b2c6115416f14f4eb74491a5d07' 
  AND token = 'Wx69Wh7gWZ/xg2GrfbKWFoRJniaWEMg5fxhsS5eIaNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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