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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40dbf42a68f1e4cc32efed88af5a04ac4d1bf8b84e41ceba8de40691e62494a6' 
  AND token = '6Wktblj2A4m5nFzl41WQdrXg0mbNn8jHHW2TMMNX0hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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