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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426d22528039fd3d6908a05a9fbc5590c0eeab69db44b3fca10370c9e6a2efe2' 
  AND token = 'qU++vV0jbJ0f53J8JgLonumCbzZec1O0MCjGlnOu48k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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