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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8025ab0bf88e8ce4e0b7b4a783051f22427be33fad52bdc31eaf2fe562366f5' 
  AND token = 'i/rCjRq8aG/tdrLuVSj9i7YZA91O9OdkEB8F+u+TGRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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