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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4fb8ed529b74cb4a6b60a62a2953c9fa9981262fc81289561c6c43ea0f0d90' 
  AND token = 'XV84rdXc9o7Vwc8ZZAhwW5Vst93MB8w6O0XPMtAbbXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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